president obama and first lady michelle obama will attend today's memorial service, so will former president george w. bush and bill clinton. >> joining us from johannesburg we know about the president, former president, tell us who will be at tuesday's memorial and sunday's state funeral. >> reporter: well, we know at least 90,000 south africans will cram into that saoccer stadium tuesday to honor nelson mandela. joining them, in addition to the u.s. presidents, will be a number of heads of states. the reason i can't give you the exact number is the south africans don't know yet due to sensitivities around traditional beliefs about not talking about this. the embassy was really only given details about the events yesterday. david cameron, the zimbabwean president will be, israelis will be here, too. it's going to be like the united nations in that football stadium on tuesday. beyond that the actual funeral will take place under a large tent in the middle of the hills, an amphitheater of natural beauty, a very remote rural area where nelson mandela grew up. there will be a huge tent, about 4